Accessibility and Ergonomic Guidelines: To create an accessible user interface, apply the following guidelines:

• Avoid using fixed font sizes and small font sizes.
• Enable accessibility options such as font size and idle time settings.
• Ensure that the user interface elements are clearly visible in low light.
• Ensure effective and easy-to-read color combinations.
• Group related objects on the screen.
• Ensure that the user interface is predictable. For example, pressing the HOME hardware button should always display the Home screen.
• For Windows Mobile-based Pocket PCs, ensure that the tap region and size of the user interface element are ergonomic.

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If your device is configured with security turned off, you do not need to install any certificate for signing your applications during development. If you have locked or third-party-signed, two-tier-prompt, or one-tier-prompt devices, you need to install the SDK certificates that you can use during development.

Locked or Third-Party-Signed Device

If you are using a physical device that has the Locked or Third-Party-Signed configuration, the only applications that will run are those applications that have been signed with a certificate in one of the device’s certificate stores. The use of the certificates that are in the certificate stores is controlled completely by the OEM, the mobile operator, or Mobile2Market. Because these certificates are private (that is, their private keys are secret), you cannot use them to sign your application during day-to-day development. Instead, you need to install other certificates in the certificate store, and then sign your application with one of them. Microsoft ships a set of certificates (and private keys) in the Windows Mobile SDK for this purpose. You can find these certificates in the Tools directory and packaged in SdkCerts.cab.
The catch is that only trusted processes can install certificates. Therefore, the device manager (the OEM or mobile operator) must set up a developer program that you can use to install these certificates.
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Character of operating system of pocket PC is true very look like with the character of PC using operating system windows. Pocket PC recognize the existence of file association owning certain extension with the program to use to run the file.
Pocket PC also recognize the same thing. Generally these associations made by the program while the installation. It is possible, you install program that owning a same function, hence last installation program take over the association with the certain file. This matter can bother, especially if last installation program really own a disappointed quality.
One of an easiest alternative by using Resco File Explorer program. You can alter the association of file easily. Click and hold up the stylus at file to be altered by its association, then select the “Associate With” and determine the program to be used to alter the file.

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